Air oven



FIG. 1 is a front perspective view of an air oven;

FIG. 2 is a back perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The portions of the article shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for an air oven, as shown and described. 